No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK? 问题

maven编译项目时出错，提示信息如下：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:testCompile (default-testCompile) on project springside-core: Compilation failure

[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException


解决方案：

  1. 下载java jdk，并安装java jdk。下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

  2. 在eclipse的菜单中，进入 Window > Preferences > Java > Installed JREs > Execution Environments，选择JavaSE-1.6, 在右侧选择jdk.

  3. 然后在maven菜单中使用 “update project ...”.关键是这个点击工程的右键，升级当前的项目，否则项目上面有叉叉。

jdk是开发工具 
jre是运行环境 
编译用的都是jdk的resources嘛，开发时不能只有运行库，应该具备开发库，就是这个意思。




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如果没有安装MAVEN插件，请点击

1. 首先安装maven插件，进入eclipse的help->marketplace，在find框中输入“maven”，选择“maven integration for eclipse(juno and newer)”项的install按钮



2. 进入window->preferences窗口，选择java->Installed JREs，默认情况下只有eclipse一项，这里要通过add按钮增加jdk对对应的路径加进来，否则在编译的时候会报错：

No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

注意：No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

意思是说：

你应该指定一个JDK，而不是一个JRE。

显示的JRE HOME，但是需要的是完整的JDK。

如果只指定JRE可以最小环境编译，但是否则MAVEN无法运行，或者保证MAVEN的运行。系统需要指定J2SE1.7的具体环境。

wKiom1R7HyHSDGTdAAOUZuSrWbE997.jpg


接着，进入Installed JREs的子项Execute Environment：在左侧选择JavaSE-1.6，右侧选择jdk



3. 在项目文件上单击右键，选择Maven->update project。



如果这个项目不是maven项目，则单击项目图标，现在configure->Convert to Maven project


4. 右键，选择Run As->Maven install，之后会开始下载编译过程中所需的文件



5. 之后，选择Maven Build，第一次运行会出现Run Configurations对话框，主要是在Goals框中输入要编译出的目标文件，Goals的选项包括：

validate 
initialize 
generate-sources 
process-sources 
generate-resources 
process-resources
compile compile 
process-classes 
generate-test-sources 
process-test-sources 
generate-test-resources 
process-test-resources 
test-compile 
process-test-classes 
test 
prepare-package
package 
pre-integration-test 
integration-test 
post-integration-test 
verify 
install 
deploy

如果goals不输入内容，编译的时候会提示

[ERROR] No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format.....

进一步的细节可以参考 http://gavin-chen.iteye.com/blog/336607